Selective epitaxially grown III-V materials based devices

ABSTRACT

A first III-V material based buffer layer is deposited on a silicon substrate. A second III-V material based buffer layer is deposited onto the first III-V material based buffer layer. A III-V material based device channel layer is deposited on the second III-V material based buffer layer.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is a U.S. National Phase Application under 35U.S.C. §371 of International Application No. PCT/US2013/048743, filedJun. 28, 2013, entitled “SELECTIVE EPITAXIALLY GROWN III-V MATERIALSBASED DEVICES”.

TECHNICAL FIELD

Embodiments as described herein relate to the field of electronic devicemanufacturing, and in particular, to manufacturing of III-V materialsbased devices.

BACKGROUND ART

Typically, defects are generated when novel materials, for example III-Vmaterials are grown on a silicon (“Si”) substrate due to latticemismatch. These defects can reduce the mobility of carriers (e.g.,electrons, holes, or both) in the III-V materials.

Due to the defects generation, integration of the III-V material baseddevices, germanium based devices, or other lattice mismatched materialsbased devices onto a silicon substrate for Complementary Metal-OxideSemiconductor (“CMOS”) systems is a big challenge.

Currently, a selective area epitaxy is used to form MOS devices on asilicon substrate. Generally, selective area epitaxy is referred to thelocal growth of an epitaxial layer through a patterned dielectric maskdeposited on a semiconductor substrate. Due to lattice mismatch, thedefects are generated when the III-V based devices are locally grown ona patterned silicon substrate. Currently there is no state of artsolution to integrate n-type and p-type III-V materials based MOSdevices on to a silicon substrate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a cross-sectional view of an electronic device structureaccording to one embodiment.

FIG. 2 is a cross-sectional view similar to FIG. 1, after a first bufferlayer is deposited on a substrate according to one embodiment.

FIG. 3 is a cross-sectional view similar to FIG. 2, after a secondbuffer layer is deposited onto the first buffer layer according to oneembodiment.

FIG. 4 is a cross-sectional view similar to FIG. 3, after a device layeris deposited onto the second buffer layer according to one embodiment.

FIG. 5 is a cross-sectional view similar to FIG. 5, after a thin caplayer is optionally grown on the device layer according to oneembodiment.

FIG. 6 is a cross-sectional view similar to FIG. 5, after a heavilydoped layer is deposited over the device layer according to oneembodiment.

FIG. 7 is a cross-sectional view similar to FIG. 6, after heavily dopedsource/drain layer is removed from a gate region of the device accordingto one embodiment.

FIG. 8 is a cross-sectional view similar to FIG. 7, after a device finis formed according to one embodiment.

FIG. 9 is a cross-sectional view similar to FIG. 8, after an insulatinglayer is deposited onto insulating layer adjacent to the sidewalls ofthe portion of the first buffer layer according to one embodiment.

FIG. 10 is a cross-sectional view similar to FIG. 9, after a gatedielectric layer and a gate electrode layer are deposited over the finaccording to one embodiment.

FIG. 11 is a perspective view of the multilayer stack as depicted inFIG. 6 according to one embodiment.

FIG. 12 is a perspective view of a portion of a tri-gate transistor asdepicted in FIG. 10 according to one embodiment.

FIG. 13 is an exemplary graph showing a Hall mobility of carriers versusInGaAs channel thickness according to one embodiment.

FIG. 14 is an exemplary graph showing an effective electron mass (m₀)versus In content (%) according to one embodiment.

FIG. 15 is an exemplary graph showing an indium content in InGaAs versusa lattice constant according to one embodiment.

FIG. 16 illustrates a computing device 1600 in accordance with oneembodiment.

DESCRIPTION OF THE EMBODIMENTS

In the following description, numerous specific details, such asspecific materials, dimensions of the elements, etc. are set forth inorder to provide thorough understanding of one or more of theembodiments as described herein. It will be apparent, however, to one ofordinary skill in the art that the one or more embodiments as describedherein may be practiced without these specific details. In otherinstances, semiconductor fabrication processes, techniques, materials,equipment, etc., have not been described in great detail to avoidunnecessary obscuring of this description.

While certain exemplary embodiments are described and shown in theaccompanying drawings, it is to be understood that such embodiments aremerely illustrative and not restrictive, and that the embodiments arenot restricted to the specific constructions and arrangements shown anddescribed because modifications may occur to those ordinarily skilled inthe art.

Reference throughout the specification to “one embodiment”, “anotherembodiment”, or “an embodiment” means that a particular feature,structure, or characteristic described in connection with the embodimentis included in at least one embodiment. Thus, the appearance of thephrases, such as “one embodiment” and “an embodiment” in various placesthroughout the specification are not necessarily all referring to thesame embodiment. Furthermore, the particular features, structures, orcharacteristics may be combined in any suitable manner in one or moreembodiments.

Moreover, inventive aspects lie in less than all the features of asingle disclosed embodiment. Thus, the claims following the DetailedDescription are hereby expressly incorporated into this DetailedDescription, with each claim standing on its own as a separateembodiment. While the exemplary embodiments have been described herein,those skilled in the art will recognize that these exemplary embodimentscan be practiced with modification and alteration as described herein.The description is thus to be regarded as illustrative rather thanlimiting.

Methods and apparatuses to manufacture selective epitaxially grown III-Vmaterials based devices are described herein. A first buffer layer isdeposited into a trench in an insulating layer on a substrate. A secondbuffer layer is deposited onto the first buffer layer. A device layer isdeposited on the second buffer layer. In an embodiment, the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer. In an embodiment, the first buffer layerhas a lattice parameter between the lattice parameter of the substrateand the device channel layer. In an embodiment, at least one of thefirst buffer layer, second buffer layer, and device layer is a III-Vmaterial based layer, and the substrate is a silicon substrate. In anembodiment, a cap layer is deposited on the device layer. In anembodiment, a fin comprising the device layer on the second buffer layeron a portion of the first buffer layer is formed. In an embodiment, agate dielectric is deposited over the fin; and source and drain regionsare formed in the fin. In an embodiment, the device layer includes achannel layer.

It at least some embodiments, a multilayer stack comprises a first III-Vmaterial based buffer layer on a silicon substrate. A second III-Vmaterial based buffer layer is deposited onto the first III-V materialsbased buffer layer. The multilayer stack comprising the second III-Vmaterial based buffer layer on the first III-V materials based bufferlayer is deposited in a trench in an insulating layer on the siliconsubstrate. The multilayer stack described herein allows III-V materialintegration on silicon using selective epitaxy approach. Selectiveepitaxial growth involves growing the multi-layer stack in the trench inthe insulating layer on the silicon substrate. The trench in theinsulating layer on the substrate has an aspect ratio (depth to width(D/W) such that the defects originating from the lattice mismatch growthare captured within the buffer layers deposited in the trench.

Buffer layers grown selectively between the substrate and a device layerprovide an advantage of capturing dislocation defects within the bottombuffer layers reducing the defects that propagate to the device layers.The layer stack combination as described herein provides an advantage ofaccommodating greater lattice mismatch between Si substrate and theIII-V device layer. In an embodiment, the III-V device layer is InGaAswith high indium (“In”) composition (e.g., at least 53%).

Embodiments of a layer stack comprising multiple buffer layers asdescribed herein accommodates lattice mismatch between Si substrate andthe III-V device channel layer. The hetero-integrated solution describedherein can be utilized to make any device architecture e.g., a trigatedevice, nanowires, nanoribbons, and the like.

FIG. 1 shows a cross-sectional view 100 of a III-V materials basedelectronic device structure according to one embodiment. A trench 103 isformed in an insulating layer 102 to expose a substrate 101.

In one embodiment, the substrate 101 includes a semiconductor material,e.g., monocrystalline silicon (“Si”), germanium (“Ge”), silicongermanium (“SiGe”), a III-V materials based material e.g., galliumarsenide (“GaAs”), or any combination thereof. In one embodiment, thesubstrate 101 includes metallization interconnect layers for integratedcircuits. In at least some embodiments, the substrate 101 includeselectronic devices, e.g., transistors, memories, capacitors, resistors,optoelectronic devices, switches, and any other active and passiveelectronic devices that are separated by an electrically insulatinglayer, for example, an interlayer dielectric, a trench insulation layer,or any other insulating layer known to one of ordinary skill in the artof the electronic device manufacturing. In at least some embodiments,the substrate 101 includes interconnects, for example, vias, configuredto connect the metallization layers.

In an embodiment, substrate 101 is a semiconductor-on-isolator (SOI)substrate including a bulk lower substrate, a middle insulation layer,and a top monocrystalline layer. The top monocrystalline layer maycomprise any material listed above, e.g., silicon.

Insulating layer 102 can be any material suitable to insulate adjacentdevices and prevent leakage. In one embodiment, electrically insulatinglayer 102 is an oxide layer, e.g., silicon dioxide, or any otherelectrically insulating layer determined by an electronic device design.In one embodiment, insulating layer 102 comprises an interlayerdielectric (ILD), e.g., silicon dioxide. In one embodiment, insulatinglayer 102 may include polyimide, epoxy, photodefinable materials, suchas benzocyclobutene (BCB), and WPR-series materials, or spin-on-glass.In one embodiment, insulating layer 102 is a low permittivity (low-k)ILD layer. Typically, low-k is referred to the dielectrics havingdielectric constant (permittivity k) lower than the permittivity ofsilicon dioxide.

In one embodiment, insulating layer 102 is a shallow trench isolation(STI) layer to provide field isolation regions that isolate one fin fromother fins on substrate 101. In one embodiment, the thickness of thelayer 102 is in the approximate range of 500 angstroms (Å) to 10,000 Å.The insulating layer 102 can be blanket deposited using any oftechniques known to one of ordinary skill in the art of electronicdevice manufacturing, such as but not limited to a chemical vapourdeposition (CVD), and a physical vapour deposition (PVP).

In an embodiment, the insulating layer 102 is patterned and etched toform trenches, such as trench 103 using one of the patterning andetching techniques known to one of ordinary skill in the art ofelectronic device manufacturing. Trench 103 has a depth D 121 and awidth W 122. An aspect ratio of the trench 103 (D/W) determines thethickness of the buffer layers deposited through that trench. Higher theD/W ratio of the trench, more thick are the buffer layers. In anembodiment, the buffer layers deposited through the trench onto thesubstrate are thick enough, so that most of the defects originated fromthe lattice mismatch are trapped within that buffer layers and areprevented from being propagated into a device layer formed on the bufferlayers. In an embodiment, the aspect ratio of the trench (D/W) is atleast 1.5, and more specifically, at least 3. In an embodiment, thewidth of the trench is determined by the width of the electronic device.The electronic device can be for example a tri-gate device, a nanowirebased device, a nanoribbons based device, or any other electronicdevice. For example, the width of the trench 103 for a tri-gatetransistor can be from about 5 nm to about 80 nm. For example, the widthof the trench 103 for a nanotube device or a nanowire device can be fromabout 5 nm to about 80 nm. In an embodiment, the depth of the trench isat least three times greater than the width of the trench. For example,for a tri-gate transistor the depth of the trench 103 can be from about250 nanometers (“nm”) to about 400 nm, and more specifically, from about300 nm to about 350 nm.

The trench 103 in the insulating layer 102 can have a square,rectangular, round, oval, or any other shape to expose the underlyingsubstrate 101. In at least some embodiments, the width of the trench isfrom about 20 nm to about 300 nm. In at least some embodiments, thedepth of the trench is from about 60 nm to about 600 nm.

FIG. 2 is a cross-sectional view 200 similar to FIG. 1, after a firstbuffer layer is deposited on a substrate according to one embodiment. Afirst buffer layer 104 is selectively deposited through trench 103 ontothe exposed portion of substrate 101. In an embodiment, buffer layer 104has a lattice parameter between the lattice parameter of the substrate101 and a device layer which is formed thereon. Generally, a latticeconstant is a lattice parameter that is typically referred as a distancebetween unit cells in a crystal lattice. Lattice parameter is a measureof the structural compatibility between different materials.

Material for the buffer layer 104 is chosen such that the latticeconstant of the first buffer layer 104 (“LC₁”) is in between the latticeconstant of Si (“LC_(si)”) and a device channel layer (“LC_(dc)”). In anembodiment, substrate 101 is a silicon substrate, and buffer layer 104comprises a III-V material. Generally, the III-V material refers to acompound semiconductor material that comprises at least one of group IIIelements of the periodic table, such as aluminum (“Al”), gallium (“Ga”),indium (“In”), and at least one of group V elements of the periodictable, such as nitrogen (“N”), phosphorus (“P”), arsenic (“As”),antimony (“Sb”). In an embodiment, buffer layer 104 is InP, GaAs,InAlAs, other III-V material, or any combination thereof. In anembodiment, the lattice constant of the first buffer layer 104 is suchthat a ratio R=(LC₁−LC_(si))/LC_(si) is from about 4% to about 8%.

In an embodiment, the thickness of the first buffer layer 104 is atleast about 50 nanometers (“nm”), and more specifically, at least about70 nm.

In an embodiment, buffer layer 104 is deposited through trench 103 ontothe exposed portion of substrate 101 using a selective area epitaxy. Asshown in FIG. 2, epitaxial buffer layer 104 is locally grown on theexposed portion of semiconductor substrate 101 through trench 103.Epitaxial buffer layer 104 can be selectively deposited through trench103 onto the exposed portion of substrate 101 using one of epitaxialtechniques known to one of ordinary skill in the art of electronicdevice manufacturing, e.g., chemical vapor deposition (“CVD”), metalloorganic chemical vapor deposition (“MOCVD”), atomic layer deposition(“ALD”), or other epitaxial growth technique known to one of ordinaryskill in the art of electronic device manufacturing. In an embodiment,the first epitaxial buffer layer of InP is deposited through trench 103onto the exposed portion of substrate 101 by a MOCVD technique attemperature from about 400° C. to about 650° C., and more specifically,at about 500° C.

FIG. 3 is a cross-sectional view 300 similar to FIG. 2, after a secondbuffer layer is deposited onto the first buffer layer according to oneembodiment. A second buffer layer 105 is selectively deposited throughtrench 103 onto buffer layer 104. In an embodiment, second buffer layer105 comprises a III-V material. In an embodiment, second buffer layer105 is indium aluminum arsenide (“In_(x)Al_(1-x)As”), indium galliumarsenide antimonide (“In_(x)Ga_(1-x)AsSb”), other III-V material, or anycombination thereof. In an embodiment, second buffer layer 105 of oneIII-V material based is deposited onto the first buffer layer 104 ofanother III-V material. In an embodiment, second III-V material basedbuffer layer 105 has a lattice parameter that matches the latticeparameter of a III-V material based device channel layer. In anembodiment, second III-V material based buffer layer 105 has a latticeparameter that matches the lattice parameter of the device layer of theIII-V material that has high indium content (at least 53% by weight),e.g., In_(x)Al_(1-x)As layer, In_(x)Ga₁₋xAsSb layer, where x is at least0.53. In more specific embodiment, second buffer layer 105 has a latticeparameter that matches the lattice parameter of the device layer of theIII-V material that has at least 70% atom fraction of indium contente.g., (“In_(x)Al_(1-x)As”, In_(x)Ga_(1-x)AsSb”), where x is at least0.7.

In an embodiment, the device channel layer is indium gallium arsenide(“InGaAs”), and buffer layer 105 is InAlAs, InGaAsSb, or any combinationthereof. In an embodiment, the choice of second buffer material that hasa bottom interface with the first buffer layer and a top interface withthe device channel layer is such that the lattice constant of the secondbuffer layer matches the lattice constant of the InGaAs channel layer.In an embodiment, the thickness of the second buffer layer 105 is atleast about 200 nm.

In an embodiment, buffer layer 105 is deposited through trench 103 ontothe buffer layer 104 using a selective area epitaxy. As shown in FIG. 2,epitaxial buffer layer 105 is locally grown on the first buffer layer104 through trench 103. Epitaxial buffer layer 105 can be selectivelydeposited through trench 103 onto the first buffer layer 104 using oneof epitaxial techniques known to one of ordinary skill in the art ofelectronic device manufacturing, e.g., chemical vapor deposition(“CVD”), metallo organic chemical vapor deposition (“MOCVD”), atomiclayer deposition (“ALD”), or other epitaxial growth technique known toone of ordinary skill in the art of electronic device manufacturing. Inan embodiment, the second epitaxial buffer layer InAlAs is depositedthrough trench 103 onto the first buffer layer 104 by a MOCVD techniqueat temperature from about 425° C. to about 650° C., and morespecifically, from about 450° C. to about 650° C.

FIG. 4 is a cross-sectional view 400 similar to FIG. 3, after a devicelayer is deposited onto the second buffer layer according to oneembodiment. A device layer 106 is selectively deposited through trench103 onto second buffer layer 105. In an embodiment, device layer 106comprises a device channel layer. The second buffer layer 105 has alattice parameter that matches the lattice parameter of device layer106. In an embodiment, device layer 106 comprises a III-V material, forexample, InGaAs, InGaAsSb that has high indium content (e.g., at least53% by weight (e.g., In_(x)Ga_(1-x)As, In_(x)Ga_(1-x)AsSb, where x is atleast 0.53). In an embodiment, device layer 105 comprises InGaAs,InGaAsSb that contains at least 70% of indium (e.g., In_(x)Ga_(1-x)As,In_(x)Ga_(1-x)AsSb, where x is at least 0.7).

In an embodiment, the device channel layer 106 is InGaAs and the secondbuffer layer 105 is InAlAs, InGaAsSb, or any combination thereof. In anembodiment, the lattice constant of the III-V material of the secondbuffer layer matches the lattice constant of the III-V material of thedevice layer 106, as described above. The thickness of the device layer106 determined by a device design. In an embodiment, the thickness ofthe device layer 106 is from about 5 nm to about 100 nm.

In an embodiment, device layer 106 is deposited through trench 103 ontothe buffer layer 105 using a selective area epitaxy. As shown in FIG. 4,device layer 106 is locally grown on the buffer layer 105 through trench103. Epitaxial device layer 106 can be selectively deposited throughtrench 103 onto the buffer layer 105 using one of epitaxial techniquesknown to one of ordinary skill in the art of electronic devicemanufacturing, e.g., chemical vapor deposition (“CVD”), metallo organicchemical vapor deposition (“MOCVD”), atomic layer deposition (“ALD”), orother epitaxial growth technique known to one of ordinary skill in theart of electronic device manufacturing. In an embodiment, the devicelayer of InGaAs is deposited through trench 103 onto the buffer layer105 by a MOCVD technique at temperature from about 400° C. to about 650°C.

FIG. 5 is a cross-sectional view 500 similar to FIG. 5, after a thin caplayer is optionally grown on the device layer according to oneembodiment. A thin cap layer can be optionally deposited onto the devicelayer 106 as an interface with high-k gate dielectrics, e.g., TaSiOx, toimprove the control of the gate. A thin cap layer 107 can be selectivelydeposited through trench 103 onto device layer 106. In an embodiment,cap layer 107 comprises a III-V material. In an embodiment, cap layer107 is InP. In an embodiment, the thickness of the cap layer 107 is fromabout 0.5 nm to about 3 nm.

In an embodiment, cap layer 107 is deposited through trench 103 onto thedevice layer 106 using a selective area epitaxy. As shown in FIG. 5, caplayer 107 is locally grown on the device layer 107 through trench 103.Cap layer 107 can be selectively deposited through trench 103 onto thedevice layer 106 using one of epitaxial techniques known to one ofordinary skill in the art of electronic device manufacturing, e.g.,chemical vapor deposition (“CVD”), metallo organic chemical vapordeposition (“MOCVD”), atomic layer deposition (“ALD”), or otherepitaxial growth technique known to one of ordinary skill in the art ofelectronic device manufacturing.

FIG. 6 is a cross-sectional view 600 similar to FIG. 5, after a heavilydoped layer is deposited over the device layer according to oneembodiment. In an embodiment, heavily doped layer 108 is deposited overthe device layer to provide a source and a drain for a transistordevice. As shown in FIG. 6, a multilayer stack is selectively grown inthe trench 103 on substrate 101 that comprises a heavily doped layer 108on cap layer 107 on device layer 106 on second buffer layer 105 on firstbuffer layer 104 on substrate 101. In an embodiment, heavilysource/drain doped layer 108 is removed from the gate region later in aprocess and left in source/drain regions during transistor fabrication.

In an embodiment, heavily doped source/drain layer 108 comprises a III-Vmaterial. In an embodiment, heavily doped layer 108 has a concentrationof dopants between 1×10¹⁹ and 1×10²¹ atoms/cm³ and comprises the III-Vmaterial that is similar to the III-V material of the device layer 107.In an embodiment, the thickness of the source/drain layer 108 isdetermined by a device design. In an embodiment, the thickness of thesource/drain layer 108 is from about 10 nm to about 100 nm. In morespecific embodiment, the thickness of the source/drain layer 108 isabout 20 nm. In an embodiment, source/drain layer 108 is depositedthrough trench 103 onto the cap layer 107 using a selective areaepitaxy. source/drain layer 108 can be selectively deposited throughtrench 103 onto the cap layer 107 using one of epitaxial techniquesknown to one of ordinary skill in the art of electronic devicemanufacturing, e.g., chemical vapor deposition (“CVD”), metallo organicchemical vapor deposition (“MOCVD”), atomic layer deposition (“ALD”), orother epitaxial growth technique known to one of ordinary skill in theart of electronic device manufacturing.

FIG. 11 is a perspective view 1100 of the multilayer stack as depictedin FIG. 6 according to one embodiment. A multilayer stack to manufacturean electronic device comprises a first buffer layer 104 in a trenchformed in an insulating layer 102 on a substrate 101. A second bufferlayer 105 is deposited on the first buffer layer 105 and a devicechannel layer 106 on the second buffer layer. The second buffer layer105 has a lattice parameter that matches the lattice parameter of thedevice channel layer 106. The first buffer layer 104 has a latticeparameter between the lattice parameter of the substrate 101 and thedevice channel layer 106 as described above.

In an embodiment, each of the first buffer layer 104, second bufferlayer 105, and device channel layer 106 is a III-V material based layer,and the substrate 101 is a silicon substrate, as described above. A caplayer 107 is optionally deposited on the device channel layer 106, asdescribed above. In an embodiment, each of the first buffer layer 104;the second buffer layer 105, the device channel layer 106, and the caplayer 107 is deposited by a chemical vapor deposition, as describedabove.

Typically, when lattice mismatched films are incorporated together,defects are formed. These defects once formed, propagate up the latticeat an angle. The multilayer stack to manufacture an electronic devicecomprising a first buffer layer 104 in a trench 103 in an insulatinglayer 102 on a substrate 101, a second buffer layer 105 on the firstbuffer layer 104; and a device channel layer 106 on the second bufferlayer 105, wherein the second buffer layer 105 has a lattice parameterthat matches the lattice parameter of the device channel layer 106, andwherein the first buffer layer 104 has a lattice parameter between thelattice parameter of the substrate 101 and the device channel layer 106allows to move a defect terminated interface well below the actualdevice channel layer 106 such that device performance is not affected.

FIG. 7 is a cross-sectional view 700 similar to FIG. 6, after heavilydoped source/drain layer is removed from a gate region 123 of the deviceaccording to one embodiment. Heavily doped source/drain layer 108 isleft intact on source/drain regions (not shown) of the device layer 106.

FIG. 8 is a cross-sectional view 800 similar to FIG. 7, after a devicefin is formed according to one embodiment. As shown in FIG. 8, a devicefin 109 comprises a portion of the optional cap layer 112 on a portionof the device layer 111 on a portion of the second buffer layer 110. Asshown in FIG. 8, fin 108 has a top surface 124, and opposing sidewalls125 and 126. In an embodiment, forming fin 109 involves depositing apatterned hard mask onto cap layer 107 and then recessing insulatinglayer 102 down to a depth determined by a device design as known to oneof ordinary skill in the art of electronic device manufacturing. In oneembodiment, insulating layer 102 is recessed by a selective etchingtechnique while leaving the fin 109 intact. For example, insulatinglayer 102 can be recessed using a selective etching technique known toone of ordinary skill in the art of electronic device manufacturing,such as but not limited to a wet etching, and a dry etching with thechemistry having substantially high selectivity to the fin on thesubstrate 101. This means that the chemistry predominantly etches theinsulating layer 102 rather than the fin of the substrate 101. In oneembodiment, a ratio of the etching rates of the insulating layer 102 tothe fin is at least 10:1.

As shown in FIG. 8, the patterned hard mask is removed from the fin 109.The patterned hard mask layer can be removed from the top of the fin 109by a polishing process, such as a CMP as known to one of ordinary skillin the art of electronic device manufacturing. As shown in FIG. 8,insulating layer 102 is recessed down to a predetermined depth thatdefines the height of the device fin 109 relative to a top surface ofthe insulation layer 102. The height and the width of the fin 109 aretypically determined by a design. In an embodiment, the height of thefin 109 is from about 10 nm to about 100 nm and the width of the fin 109is from about 5 nm to about 20 nm.

FIG. 9 is a cross-sectional view 900 similar to FIG. 8, after aninsulating layer 113 is deposited onto insulating layer 102 adjacent tothe sidewalls of the portion of the first buffer layer 110 according toone embodiment. In an embodiment, insulating layer 113 can be anymaterial suitable to insulate adjacent devices and prevent leakage fromthe fins. In one embodiment, electrically insulating layer 113 is anoxide layer, e.g., silicon dioxide, or any other electrically insulatinglayer determined by a design. In one embodiment, insulating layer 113 isa STI layer to provide field isolation regions that isolate one fin fromother fins on substrate 101. In one embodiment, the thickness of theinsulating layer 113 corresponds to the thickness of the portion of thesecond buffer layer 110 that is determined by a fin device design. In anembodiment, the thickness of the insulating layer 113 is in theapproximate range of 1 nm to about 30 nm. The insulating layer 113 canbe blanket deposited using any of techniques known to one of ordinaryskill in the art of electronic device manufacturing, such as but notlimited to a chemical vapour deposition (CVD), and a physical vapourdeposition (PVP). In an embodiment

FIG. 10 is a cross-sectional view 1000 similar to FIG. 9, after a gatedielectric layer and a gate electrode layer are deposited over the finaccording to one embodiment. A gate dielectric layer 114 is formed onand around three sides of the semiconductor fin 109. As shown in FIG.10, gate dielectric layer 114 is formed on or adjacent to top surface124, on or adjacent to sidewall 125, and on or adjacent to sidewall 126of fin 109. Gate dielectric layer 114 can be any well-known gatedielectric layer.

In one embodiment, gate dielectric layer 114 is a high-k dielectricmaterial having a dielectric constant greater than the dielectricconstant of silicon dioxide. In one embodiment, electrically insulatinggate dielectric layer 114 comprises a high-k dielectric material, suchas a metal oxide dielectric. For example, gate dielectric layer 114 canbe but not limited to tantalum silicon oxide (TaSiOx); pentaoxide (Ta₂O₅), and titantium oxide (TiO₂) zirconium oxide (ZrO₂), hafnium oxide(HfO₂), lanthanum oxide (La₂O₄), lead zirconium titanate (PZT), otherhigh-k dielectric material, or a combination thereof. In an embodiment,the gate dielectric layer 114 is a silicon dioxide (SiO₂), siliconoxynitride (SiO_(x) N_(y)) or a silicon nitride (Si₃ N₄) dielectriclayer. In an embodiment, the thickness of the gate dielectric layer 114is in the approximate range between about 1 nm to about 20 nm, and morespecifically, between about 5 nm to about 10 nm.

As shown in FIG. 10, a gate electrode layer 115 is deposited on the gatedielectric layer 114 on the fin 109. Gate electrode 115 is formed on andaround the gate dielectric layer 114 as shown in FIG. 10. Gate electrode115 is formed on or adjacent to gate dielectric 114 on sidewall 125 ofsemiconductor fin 109, is formed on gate dielectric 114 on the topsurface 124 of semiconductor fin 109, and is formed adjacent to or ongate dielectric layer 114 on sidewall 125 of semiconductor fin 109.

As shown in FIG. 10, gate electrode 115 has a top 130 and a pair oflaterally opposite sidewalls, such as a sidewall 127 and a sidewall 128separated by a distance which defines the length of the channel of thefin device. Gate electrode 115 can be formed of any suitable gateelectrode material. In an embodiment, the gate electrode 115 is a metalgate electrode, such as but not limited to, tungsten, tantalum,titanium, and their nitrides. It is to be appreciated, the gateelectrode 115 need not necessarily be a single material and can be acomposite stack of thin films, such as but not limited to apolycrystalline silicon/metal electrode or a metal/polycrystallinesilicon electrode. In an embodiment, gate electrode 115 comprises ofpolycrystalline silicon doped to a concentration density between 1×10¹⁹atoms/cm³ to 1×10²⁰ atoms/cm³.

FIG. 12 is a perspective view 1200 of a portion of a tri-gate transistoras depicted in FIG. 10 according to one embodiment. As shown in FIG. 12,a tri-gate transistor includes an electrically insulating layer 302 on asubstrate 301 adjacent to a fin 309. In one embodiment, the tri-gatetransistor is coupled to one or more layers of metallization (notshown). The one or more metallization layers can be separated fromadjacent metallization layers by dielectric material, e.g., interlayerdielectric (ILD) (not shown). The adjacent metallization layers may beelectrically interconnected by vias (not shown).

As shown in FIG. 12, a fin 309 protrudes from a top surface ofinsulating layer 302. Fin 309 comprises an optional III-V material basedcap layer 308 on a III-V material based device channel layer 307 on aportion 306 of a III-V material based second buffer layer 305 on a III-Vmaterial based first buffer layer 304. A gate electrode 311 is formed onand around the gate dielectric 310.

The fin 309 comprising an optional III-V material based cap layer 308 ona III-V material based device channel layer 307 on a portion 306 of aIII-V material based second buffer layer 305 on a III-V material basedfirst buffer layer 304, wherein the second buffer layer has a latticeparameter that matches the lattice parameter of the device channellayer, and wherein the first buffer layer has a lattice parameterbetween the lattice parameter of the substrate and the device layerprovides accommodation of the lattice mismatch between the substrate 301and the device channel layer 307 such that defects can be capturedwithin the thickness of the buffer layers 304 and 305.

As shown in FIG. 12, fin 309 has a pair of opposing sidewalls separatedby a distance which defines a semiconductor fin width. In oneembodiment, the fin width is in an approximate range from about 5 nm toabout 50 nm. In one embodiment, the length of the fins is greater thanthe width and is determined by a design. In one embodiment, the lengthof the fins is from about 50 nm to hundreds of microns. In anembodiment, the fin height above the top surface of the insulating layer302 is in an approximate range from about 5 nm to about 500 nm.

As shown in FIG. 12, a gate electrode 311 is deposited on the gatedielectric 310 on the fin 309. Gate electrode 311 is formed on andaround the gate dielectric 310. A source region and a drain region areformed at opposite sides of the gate electrode 311 in a device layerportion 313 of the fin 313. One of source/drain electrodes 312 is formedon the source/drain region at one side of gate electrode 311, andanother one of source/drain electrodes (not shown) is formed on thesource/drain region at an opposite side of gate electrode 311 using oneof techniques known to one of ordinary skill in the art of electronicdevice manufacturing.

The source and drain regions are formed of the same conductivity typesuch as N-type or P-type conductivity. In an embodiment, the source anddrain regions have a doping concentration of between 1×10¹⁹, and 1×10²¹atoms/cm³. The source and drain regions can be formed of uniformconcentration or can include sub-regions of different concentrations ordoping profiles such as tip regions (e.g., source/drain extensions). Inan embodiment, the source and drain regions have the same dopingconcentration and profile. In an embodiment, the doping concentrationand profile of the source and drain regions can vary in to obtain aparticular electrical characteristic. The portion of the fin 309 locatedbetween the source region and drain regions, defines a channel region314 of the transistor.

The channel region 314 can also be defined as the area of thesemiconductor fin 309 surrounded by the gate electrode 311. At timeshowever, the source/drain region may extend slightly beneath the gateelectrode through, for example, diffusion to define a channel regionslightly smaller than the gate electrode length (Lg). In an embodiment,channel region 314 is intrinsic or undoped. In an embodiment, channelregion 314 is doped, for example to a conductivity level of between1×1016 to 1×1019 atoms/cm3. In an embodiment, when the channel region isdoped it is typically doped to the opposite conductivity type of thesource/drain region. For example, when the source and drain regions areN-type conductivity the channel region would be doped to p typeconductivity. Similarly, when the source and drain regions are P typeconductivity the channel region would be N-type conductivity. In thismanner a tri-gate transistor 100 can be formed into either a NMOStransistor or a PMOS transistor respectively.

Channel regions, such as channel region 314 can be uniformly doped orcan be doped non-uniformly or with differing concentrations to provideparticular electrical and performance characteristics. For example,channel regions, such as channel region 314 can include well-known haloregions, if desired. As shown in FIG. 12, the tri-gate transistor has adielectric 310 and a gate electrode 311 surrounding the semiconductorfin 309 on three sides that provides three channels on the fin 309, onechannel extends between the source and drain regions on one sidewall ofthe fin, such as sidewall 315, a second channel extends between thesource and drain regions on the top surface of the fin, such as surface317, and the third channel extends between the source and drain regionson the other sidewall of the fin, such as sidewall 316.

In an embodiment, the source regions of the transistor 1200 areelectrically coupled to higher levels of metallization (e.g., metal 1,metal 2, metal 3, and so on) to electrically interconnect varioustransistors of the array into functional circuits. In one embodiment,the drain regions of the transistor 1200 are coupled to higher levels ofmetallization (e.g., metal 1, metal 2, metal 3, and so on) toelectrically interconnect various transistors of the array together intofunctional circuits.

FIG. 13 is an exemplary graph 1300 showing a Hall mobility of carriers(e.g., electrons, holes) 1301 versus InGaAs channel thickness 1302according to one embodiment. InGaAs material with high (e.g., at least70%) indium composition, such as In_(0.7)Ga_(0.3)As has high carriermobility that makes it an attractive channel material option for a III-Vdevice. Using InGaAs with high (e.g., at least 70%) indium composition,such as In_(0.7)Ga_(0.3)As as a device channel layer increasesperformance of the device and increases device gain. Data 1303 showsthat Hall mobility is maintained high at about 10,000 cm²/(V·s) down toa thin device body of 5 nm. There is no impact of surface roughness tomobility of carriers.

FIG. 14 is an exemplary graph 1400 showing an effective electron mass(m₀) 1401 versus In content (%) 1402 according to one embodiment. Data1403 indicate that m₀ decreases with higher indium content (%). With areference to FIG. 12, to increase the height of the fin (“H_(si)”) ofthe fin in the tri-gate device made using InGaAs having high (e.g., 70%)indium content (e.g., In_(0.7)Ga_(0.3)As), the lattice mismatch betweenthe channel (e.g., layer 307) and the bottom buffer adjacent to thechannel (e.g., buffer layer 305) needs to be minimized. If the latticemismatch is large, to prevent new defects generation, the thickness ofthe In_(0.7)Ga_(0.3)As (and hence H_(si)) needs to be limited to acritical layer thickness. As a result, the bottom buffer layer adjacentto In_(0.7)Ga_(0.3)As device channel layer needs to have a latticeconstant substantially the same (or close to) as the In_(0.7)Ga_(0.3)Aschannel. Similar lattice constants of the device channel layer, such asdevice channel layer 307 and the underlying portion of buffer layer,such as portion 306 of second buffer layer 305 allow (1) trigate H_(si)to be unlimited, (2) prevents any new defects to be generated at thechannel/adjacent bottom buffer and (3) allows all defects that arecreated at an interface between the second buffer layer and the firstbuffer layer, such as between buffer layer 305 and buffer layer 303, andall defects that are created at an interface between first buffer layerand Si substrate, such as between buffer layer 303 and substrate 301 inthe trench, such as a trench 303 to be captured well before the devicechannel layer, such as device channel layer 307.

FIG. 15 is an exemplary graph 1500 showing an indium content in InGaAs1501 versus a lattice constant 1502 according to one embodiment. Asshown in FIG. 15 higher indium concentration in the InGaAs device allowseasier to achieve gate all around (“GAA”) silicon architecture.Increasing of indium content increases a lattice constant of InGaAs. Asshown in FIG. 15, a trigate device 1503 needs a new buffer forIn_(0.7)Ga_(0.3) As due to a critical layer thickness. A nanowire device1504 has a thickness t less than a critical layer thickness tc (t<tc).

Data 1505 show that manufacturing a III-V material based device channellayer on a III-V material based second buffer layer on a III-V materialbased first buffer layer, wherein the second buffer layer has a latticeparameter that matches the lattice parameter of the device channellayer, and wherein the first buffer layer has a lattice parameterbetween the lattice parameter of the substrate and the device layer(e.g., a trigate on a buffer device 1503, a nanowire on a buffer device1504) allow to increase the device performance.

FIG. 16 illustrates a computing device 1600 in accordance with oneembodiment. The computing device 1600 houses a board 1602. The board1602 may include a number of components, including but not limited to aprocessor 1601 and at least one communication chip 1604. The processor1601 is physically and electrically coupled to the board 1602. In someimplementations at least one communication chip is also physically andelectrically coupled to the board 1602. In further implementations, atleast one communication chip 1604 is part of the processor 1601.

Depending on its application, computing device 1600 may include othercomponents that may or may not be physically and electrically coupled tothe board 1602. These other components include, but are not limited to,a memory, such as a volatile memory 1608 (e.g., a DRAM), a non-volatilememory 1610 (e.g., ROM), a flash memory, a graphics processor 1612, adigital signal processor (not shown), a crypto processor (not shown), achipset 1614, an antenna 1616, a display, e.g., a touchscreen display1617, a display controller, e.g., a touchscreen controller 1611, abattery 1618, an audio codec (not shown), a video codec (not shown), anamplifier, e.g., a power amplifier 1609, a global positioning system(GPS) device 1613, a compass 1614, an accelerometer (not shown), agyroscope (not shown), a speaker 1615, a camera 1603, and a mass storagedevice (such as hard disk drive, compact disk (CD), digital versatiledisk (DVD), and so forth) (not shown).

A communication chip, e.g., communication chip 1604, enables wirelesscommunications for the transfer of data to and from the computing device1600. The term “wireless” and its derivatives may be used to describecircuits, devices, systems, methods, techniques, communicationschannels, etc., that may communicate data through the use of modulatedelectromagnetic radiation through a non-solid medium. The term does notimply that the associated devices do not contain any wires, although insome embodiments they might not. The communication chip 1604 mayimplement any of a number of wireless standards or protocols, includingbut not limited to Wi-Fi (IEEE 802.11 family), WiMAX (IEEE 802.16family), IEEE 802.20, long term evolution (LTE), Ev-DO, HSPA+, HSDPA+,HSUPA+, EDGE, GSM, GPRS, CDMA, TDMA, DECT, Bluetooth, derivativesthereof, as well as any other wireless protocols that are designated as3G, 4G, 5G, and beyond. The computing device 1600 may include aplurality of communication chips. For instance, a communication chip1604 may be dedicated to shorter range wireless communications such asWi-Fi and Bluetooth and a communication chip 1636 may be dedicated tolonger range wireless communications such as GPS, EDGE, GPRS, CDMA,WiMAX, LTE, Ev-DO, and others.

In at least some embodiments, at least some of the components of thecomputing device 1600 (e.g., processor 1601, communication chip 1604,graphic CPU 1612) include a multilayer stack comprising a first III-Vmaterial based buffer layer in a trench in an insulating layer on asilicon substrate, a second III-V material based buffer layer on thefirst III-V material based buffer layer; and a III-V material baseddevice layer on the second buffer layer, wherein the second III-Vmaterial based buffer layer has a lattice parameter that matches thelattice parameter of the III-V material based device channel layer, andwherein the first III-V material based buffer layer has a latticeparameter between the lattice parameter of the silicon substrate and theIII-V material based device layer, as described herein.

An integrated circuit die of at least some components of the computingdevice 1600 (e.g., processor 1601, graphic CPU 1612) include one or moreIII-V materials based devices, such as tri-gate transistors, nanowires,nanoribbons manufactured using methods as described herein. The term“processor” may refer to any device or portion of a device thatprocesses electronic data from registers and/or memory to transform thatelectronic data into other electronic data that may be stored inregisters and/or memory.

The communication chip 1604 also can include a multilayer stackcomprising a first III-V material based buffer layer in a trench in aninsulating layer on a silicon substrate, a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device layer on the second buffer layer, wherein thesecond III-V material based buffer layer has a lattice parameter thatmatches the lattice parameter of the III-V material based device channellayer, and wherein the first III-V material based buffer layer has alattice parameter between the lattice parameter of the silicon substrateand the III-V material based device layer, according to the embodimentsdescribed herein.

In further implementations, another component housed within thecomputing device 1600 may contain a multilayer stack comprising a firstIII-V material based buffer layer in a trench in an insulating layer ona silicon substrate, a second III-V material based buffer layer on thefirst III-V material based buffer layer; and a III-V material baseddevice layer on the second buffer layer, wherein the second III-Vmaterial based buffer layer has a lattice parameter that matches thelattice parameter of the III-V material based device channel layer, andwherein the first III-V material based buffer layer has a latticeparameter between the lattice parameter of the silicon substrate and theIII-V material based device layer according to embodiments describedherein.

In accordance with one implementation, the integrated circuit die of thecommunication chip includes one or more devices, such as tri-gatetransistors, nanowire, and nanoribbon devices, as described herein. Invarious implementations, the computing device 1600 may be a laptop, anetbook, a notebook, an ultrabook, a smartphone, a tablet, a personaldigital assistant (PDA), an ultra mobile PC, a mobile phone, a desktopcomputer, a server, a printer, a scanner, a monitor, a set-top box, anentertainment control unit, a digital camera, a portable music player,or a digital video recorder. In further implementations, the computingdevice 1600 may be any other electronic device that processes data.

The following examples pertain to further embodiments:

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer on a siliconsubstrate; depositing a second III-V material based buffer layer ontothe first III-V material based buffer layer; and depositing a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer on a siliconsubstrate; depositing a second III-V material based buffer layer ontothe first III-V material based buffer layer; and depositing a materialbased device channel layer on the second III-V material based bufferlayer, wherein the second III-V material based buffer layer has alattice parameter that matches the lattice parameter of the III-Vmaterial based device channel layer.

A method to manufacture a material based device comprising depositing afirst III-V material based buffer layer on a silicon substrate;depositing a second III-V material based buffer layer onto the firstIII-V material based buffer layer; and depositing a III-V material baseddevice channel layer on the second III-V material based buffer layer,wherein the first III-V material based buffer layer has a latticeparameter between the lattice parameter of the silicon substrate and theIII-V material based device channel layer.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer on a siliconsubstrate; depositing a second III-V material based buffer layer ontothe first III-V material based buffer layer; and depositing a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer and depositing a cap layer on the III-V material baseddevice channel layer.

A method to manufacture a III-V material based device comprising forminga trench in an insulating layer on a silicon substrate depositing afirst III-V material based buffer layer into the trench on the siliconsubstrate; depositing a second III-V material based buffer layer ontothe first III-V material based buffer layer; and depositing a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer into a trench in aninsulating layer on the silicon substrate; depositing a second III-Vmaterial based buffer layer onto the first III-V material based bufferlayer; depositing a III-V material based device channel layer on thesecond III-V material based buffer layer; and depositing a gatedielectric layer over the III-V material based device channel layer.

A method to manufacture a material based device comprising depositing afirst III-V material based buffer layer into a trench in an insulatinglayer on the silicon substrate; depositing a second III-V material basedbuffer layer onto the first material based buffer layer; depositing aIII-V material based device channel layer on the second III-V materialbased buffer layer; forming a fin comprising the III-V material baseddevice channel layer on the second III-V material based buffer layer ona portion of the first III-V material based buffer layer; and depositinga gate dielectric layer on the fin.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer into a trench in aninsulating layer on the silicon substrate; depositing a second III-Vmaterial based buffer layer onto the first III-V material based bufferlayer; depositing a III-V material based device channel layer on thesecond III-V material based buffer layer, and depositing a doped III-Vmaterial based layer over the III-V material based device channel layer.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer into a trench in aninsulating layer on the silicon substrate; depositing a second materialbased buffer layer onto the first III-V material based buffer layer;depositing a III-V material based device channel layer on the secondIII-V material based buffer layer, wherein concentration of indium inthe III-V material based device channel layer is at least 53%.

A method to manufacture a III-V material based device comprisingdepositing a first III-V material based buffer layer into a trench in aninsulating layer on the silicon substrate; depositing a second III-Vmaterial based buffer layer onto the first material based buffer layer;depositing a III-V material based device channel layer on the secondIII-V material based buffer layer, wherein at least one of the firstIII-V material based buffer layer; the second III-V material basedbuffer layer, and the III-V material based device channel layer isdeposited by a chemical vapor deposition.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer, wherein the second III-V material based buffer layer has alattice parameter that matches the lattice parameter of the III-Vmaterial based device channel layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer, wherein the first III-V material based buffer layer has alattice parameter between the lattice parameter of the silicon substrateand the III-V material based device channel layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second material based bufferlayer, wherein at least one of the first III-V material based bufferlayer; the second III-V material based buffer layer, and the III-Vmaterial based device channel layer is deposited by a chemical vapordeposition.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer, wherein a cap layer is deposited on the III-V materialbased device channel layer. A III-V material based device, comprising: atrench in an insulating layer on the substrate; a first III-V materialbased buffer layer in the trench on the silicon substrate; a secondIII-V material based buffer layer on the first material based bufferlayer; and a III-V material based device channel layer on the secondmaterial based buffer layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer; and a gate dielectric layer over the III-V material baseddevice channel layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer, wherein a fin is formed from the III-V material baseddevice channel layer, the second III-V material based buffer layer; andthe first III-V material based buffer layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer; and a doped III-V material based layer over a portion ofthe III-V material based device channel layer.

A III-V material based device, comprising: a first III-V material basedbuffer layer on a silicon substrate; a second III-V material basedbuffer layer on the first III-V material based buffer layer; and a III-Vmaterial based device channel layer on the second III-V material basedbuffer layer, wherein concentration of indium in the III-V materialbased device channel layer is at least 53%.

A method to manufacture an electronic device comprising depositing afirst buffer layer into a trench in an insulating layer on a substrate;depositing a second buffer layer onto the first buffer layer; anddepositing a device layer on the second buffer layer, wherein the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer.

A method to manufacture an electronic device comprising depositing afirst buffer layer into a trench in an insulating layer on a substrate;depositing a second buffer layer onto the first buffer layer; anddepositing a device layer on the second buffer layer, wherein the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer, and wherein the first buffer layer has alattice parameter between the lattice parameter of the substrate and thedevice layer.

A method to manufacture an electronic device comprising depositing afirst buffer layer into a trench in an insulating layer on a substrate;depositing a second buffer layer onto the first buffer layer; anddepositing a device layer on the second buffer layer, wherein the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer, wherein the first buffer layer has alattice parameter between the lattice parameter of the substrate and thedevice layer, and wherein at least one of the first buffer layer, secondbuffer layer, and device layer is a III-V material based layer, and thesubstrate is a silicon substrate.

A method to manufacture an electronic device comprising depositing afirst buffer layer into a trench in an insulating layer on a substrate;depositing a second buffer layer onto the first buffer layer; anddepositing a device layer on the second buffer layer, wherein the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer, and wherein the first buffer layer has alattice parameter between the lattice parameter of the substrate and thedevice layer, wherein at least one of the first buffer layer, secondbuffer layer, and device layer is a III-V material based layer, and thesubstrate is a silicon substrate.

A method to manufacture an electronic device comprising depositing afirst buffer layer into a trench in an insulating layer on a substrate;depositing a second buffer layer onto the first buffer layer; anddepositing a device layer on the second buffer layer, wherein the secondbuffer layer has a lattice parameter that matches the lattice parameterof the device channel layer, and wherein the first buffer layer has alattice parameter between the lattice parameter of the substrate and thedevice layer, and wherein a cap layer is deposited on the device layer.

An electronic device comprising a first buffer layer in a trench in aninsulating layer on a substrate, a second buffer layer on the firstbuffer layer; and a device layer on the second buffer layer, wherein thesecond buffer layer has a lattice parameter that matches the latticeparameter of the device channel layer, and wherein the first bufferlayer has a lattice parameter between the lattice parameter of thesubstrate and the device layer.

An electronic device comprising a first buffer layer in a trench in aninsulating layer on a substrate, a second buffer layer on the firstbuffer layer; and a device layer on the second buffer layer, wherein thesecond buffer layer has a lattice parameter that matches the latticeparameter of the device channel layer, and wherein the first bufferlayer has a lattice parameter between the lattice parameter of thesubstrate and the device layer, and wherein at least one of the firstbuffer layer, second buffer layer, and device layer is a III-V materialbased layer, and the substrate is a silicon substrate.

An electronic device comprising a first buffer layer in a trench in aninsulating layer on a substrate, a second buffer layer on the firstbuffer layer; and a device layer on the second buffer layer, wherein thesecond buffer layer has a lattice parameter that matches the latticeparameter of the device channel layer, and wherein the first bufferlayer has a lattice parameter between the lattice parameter of thesubstrate and the device layer, and wherein a cap layer is deposited onthe device layer.

What is claimed is:
 1. A method to manufacture a III-V material baseddevice, comprising: forming a trench in an insulating layer on a siliconsubstrate; depositing a first III-V material based buffer layer into thetrench on the silicon substrate; depositing a second III-V materialbased buffer layer onto the first III-V material based buffer layer; anddepositing a III-V material based device channel layer on the secondIII-V material based buffer layer.
 2. The method of claim 1, wherein thesecond III-V material based buffer layer has a lattice parameter thatmatches the lattice parameter of the III-V material based device channellayer.
 3. The method of claim 1, wherein the first III-V material basedbuffer layer has a lattice parameter between the lattice parameter ofthe silicon substrate and the III-V material based device channel layer.4. The method of claim 1, further comprising depositing a cap layer onthe III-V material based device channel layer.
 5. The method of claim 1,further comprising depositing a gate dielectric layer over the III-Vmaterial based device channel layer.
 6. The method of claim 1, furthercomprising forming a fin comprising the III-V material based devicechannel layer on the second III-V material based buffer layer.
 7. Themethod of claim 1, further comprising depositing a doped III-V materialbased layer over the III-V material based device channel layer.
 8. Themethod of claim 1, wherein concentration of indium in the III-V materialbased device channel layer is at least 53%.
 9. The method of claim 1,wherein at least one of the first III-V material based buffer layer; thesecond III-V material based buffer layer, and the III-V material baseddevice channel layer is deposited by a chemical vapor deposition.
 10. AIII-V material based device, comprising: a trench in an insulating layeron a silicon substrate; a first III-V material based buffer layerdeposited into the trench in the insulating layer on the siliconsubstrate; a second III-V material based buffer layer on the first III-Vmaterial based buffer layer; and a III-V material based device channellayer on the second III-V material based buffer layer.
 11. The III-Vmaterial based device of claim 10, wherein the second III-V materialbased buffer layer has a lattice parameter that matches the latticeparameter of the III-V material based device channel layer.
 12. TheIII-V material based device of claim 10, wherein the first III-Vmaterial based buffer layer has a lattice parameter between the latticeparameter of the silicon substrate and the III-V material based devicechannel layer.
 13. The III-V material based device of claim 10, whereinat least one of the first III-V material based buffer layer; the secondIII-V material based buffer layer, and the III-V material based devicechannel layer is deposited by a chemical vapor deposition.
 14. The III-Vmaterial based device of claim 10, wherein a cap layer is deposited onthe III-V material based device channel layer.
 15. The III-V materialbased device of claim 10, further comprising a gate dielectric layerover the III-V material based device channel layer.
 16. The III-Vmaterial based device of claim 10, wherein a fin is formed from theIII-V material based device channel layer and the second III-V materialbased buffer layer.
 17. The III-V material based device of claim 10,further comprising a doped III-V material based layer over a portion ofthe III-V material based device channel layer.
 18. The III-V materialbased device of claim 10, wherein concentration of indium in the III-Vmaterial based device channel layer is at least 53%.